Malicious PDF — malware analysis report

Static analysis result for SHA-256 4957908044bb09f4…

MALICIOUS

PDF

93.8 KB Created: 2021-07-21 05:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3727c0632bf55c88a6a1333bbdda3459 SHA-1: af453656c5ef222f84ba9dd14ed71dd961485b19 SHA-256: 4957908044bb09f4875ff1c54b5c3218e3eb74a03d8d20e4c10e46e49d8e71b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to websites that appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of link farms on compromised CMS uploads suggests an attempt to obscure the true destination or leverage existing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://bahtiyardishekimi.com/fckfiles/file/xulos.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2beb9cd5c---11000368100.pdf
    • http://ccshecea.org/upload/files/rafaxaguwebonus.pdf
    • https://mandarinusa.com/userfiles/file/1626627792.pdf
    • https://eobliecky.sk/userfiles/file/rokunetididomitafedavug.pdf
    • http://klubbelgickychobrov.sk/editor_uploads/files/15141326924.pdf
    • http://centralwestwoodclassof1983.com/clients/c/cd/cd4b3c89dd1500142a52f05b9125c350/File/varozamosusagazo.pdf
    • http://macabrey-luthier.fr/data/Files/pebofevosu.pdf
    • https://rybczewice.pl/userfiles/file/wasigukomozo.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/787a63dba4dbe17c32b18094f0e10ddc/74272146536.pdf
    • http://moto-bike.pl/userfiles/file/fajalalezawesuva.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/bfv0jt5uuuo2a3ceii8lgvr741/31435530435.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/wudinizapexutiravuxusi.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/lurarosan.pdf
    • http://boisehighclassof1965.com/clients/879780/File/70534383638.pdf
    • http://malifer.hu/upload/file/52990160166.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607016f00af14---bekamojadat.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/doser.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/595dbe4618ecc215338c0852d6c74c22/gasimibaniserikus.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebe4e00cdf---30624190312.pdf
    • https://amgaa.org/temp//files/sudutuxo.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/figeg.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/d1f40334762924d69de27347532e70e2/mujenesovolodedamovab.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=shadowhunters+books+alec+and+magnus
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108dc.bin
25af8a036c3e558500c6e496ed48e09204ff0563abbad7741b2a9ea13c9c7029
pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 11220 bytes
font_01_sfnt_off000122d6.bin
a5953d166e205788c3f0063d7a8dc4744d6637fa2af3a6cfd7b221eceb17c910
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D6 17616 bytes
font_02_sfnt_off00015010.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15010 16792 bytes